Neil Young with Crazy Horse will join an all-star cast Saturday (Sept. 29) during the Global Citizen Festival in New York City. The event in Central Park will also feature performances by Foo Fighters, the Black Keys, Band of Horses and K'Naan and will be streamed live on MTV.com and other media partners. Produced by AEG Network Live and delivered by AEG Digital Media, the festival will celebrate achievements and create awareness around the UN General Assembly in New York when world leaders will convene to debate the Millennium Development Goals and make commitments to end extreme poverty. Airing live at 4 p.m. ET, the event will be hosted by Katie Couric, Jeffrey Sachs, Jack Dorsey, Olivia Wilde, Minka Kelly, Sophia Bush, Selena Gomez and Katharine McPhee.